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Theory of Machine

Theory of Machine
Elements of pairs held together mechanically is known as

Open pair
Rolling pair
Mechanical pair
Closed pair

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Theory of Machine
The critical speed of a shaft depends upon its

Mass and stiffness
Stiffness and eccentricity
Stiffness
Mass

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Theory of Machine
In involute gears, the pressure angle is

Always variable
Dependent on the size of teeth
Always constant
Dependent on the size of gears

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Theory of Machine
The partial balancing of reciprocating parts in locomotives produces

All of these
Hammer blow
Variation in tractive force along the line of stroke
Swaying couple

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Theory of Machine
Rectangular bar in a rectangular hole is the following type of pair

Freely constrained motion
Partially constrained motion
Completely constrained motion
Incompletely constrained motion

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Theory of Machine
In a Hartnell governor, the lift of the sleeve is given by (where r₁ and r₂ = Max. and min. radii of rotation, x = Length of ball arm of the lever, and y = Length of sleeve arm of the lever)

(r₁ - r₂) (x/y)
(r₁ + r₂) (y/x)
(r₁ + r₂) (x/y)
(r₁ - r₂) (y/x)

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